Add all dart:html tests from the sdk to test/codegen.

test/codegen/expect/html_config.js

Index: test/codegen/expect/html_config.js
diff --git a/test/codegen/expect/html_config.js b/test/codegen/expect/html_config.js
new file mode 100644
index 0000000000000000000000000000000000000000..ec6077ec37dbdc01e7aed3995bb1b059d8164c6f
--- /dev/null
+++ b/test/codegen/expect/html_config.js
@@ -0,0 +1,11 @@
+dart_library.library('html_config', null, /* Imports */[
+  'dart_sdk'
+], function(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const html_config = Object.create(null);
+  // Exports:
+  exports.html_config = html_config;
+});